Resin composition and preparation method therefor

Abstract

The present disclosure relates to a rubber composition and a method of preparing the same, the rubber composition comprising a viscosity modifier and a modified polymer having a structure in which a molecular weight regulator is coupled to at least one of both ends of an at least partially hydrogenated or non-hydrogenated petroleum resin. The rubber composition according to the present disclosure has improved processability and thus may replace process oil, and may markedly improve gas impermeability.

What is claimed is: 
     
         1 . A resin composition comprising a modified polymer having a structure in which a molecular weight regulator is coupled to at least one of both ends of an at least partially hydrogenated or non-hydrogenated petroleum resin,
 wherein the resin composition further comprises a viscosity controller, and   wherein the viscosity controller is a low-viscosity liquid resin having a viscosity (25° C.) of 20-500 cps, and   wherein the low-viscosity liquid resin is selected from hydrogenated DCPD-C 9  copolymer resins, hydrogenated DCPD resins, and mixtures thereof.   
     
     
         2 . The resin composition of  claim 1 , wherein the petroleum resin comprises a C 9  monomer-derived repeating unit. 
     
     
         3 . The resin composition of  claim 2 , wherein the C 9  monomer-derived repeating unit comprises vinyltoluene, α-methylstyrene, styrene, dicyclopentadiene, indene, and methylindene. 
     
     
         4 . The resin composition of  claim 1 , wherein the molecular weight regulator is selected from ethyl mercaptan, butyl mercaptan, hexyl mercaptan, dodecyl mercaptan, phenyl mercaptan, benzyl mercaptan, mercaptoethanol, thioglycolic acid, mercapto propionic acid, pentaerythritol tetrakis(3-mercapto) propionate, and mixtures of two or more thereof. 
     
     
         5 . The resin composition of  claim 1 , wherein the resin composition has a number average molecular weight of 200 to 500, and a glass transition temperature of −25 to −15° C. 
     
     
         6 . The resin composition of  claim 1 , wherein the resin composition has a viscosity of 2,000-4,000 cps, as measured at 60° C., and aromaticity of 30% to 50%. 
     
     
         7 . The resin composition of  claim 1 , wherein the resin composition comprises 80-98% by weight and 2-20% by weight of the modified polymer and the viscosity controller, respectively. 
     
     
         8 . A rubber composition including a raw material rubber and the resin composition according to  claim 1 , the rubber composition comprising 5-25 parts by weight of the resin composition, on the basis of 100 parts by weight of the raw material rubber. 
     
     
         9 . The rubber composition of  claim 8 , wherein the rubber composition comprises, on the basis of 100 parts by weight of the raw material rubber, 1-8 parts by weight of a homogenizing agent, 20-80 parts by weight of a reinforcing agent, and 0.1-10 parts by weight of a vulcanization adjuvant. 
     
     
         10 . The rubber composition of  claim 8 , wherein the rubber composition comprises, on the basis of 100 parts by weight of the raw material rubber, 0.1-2 parts by weight of sulfur, and 0.5-5 parts by weight of a vulcanization accelerator. 
     
     
         11 . The rubber composition of  claim 8 , wherein the rubber composition, after being prepared as a rubber specimen, has gas permeability of 90 cm 3 /(m 2 .day.atm) or less, as measured by a KS M ISO 2556 method.